Soft-tissue rim sign

• The CT evaluation of stone disease has given rise to new signs as Soft-tissue rim sign. This sign is caused by edema of the ureteral wall surrounding a stone at its site of impaction.

• The importance of the sign lies in the fact that it may help to distinguish a stone in the ureter from a phlebolith in an adjacent vein, because the occurrence of a soft-tissue rim around a phlebolith is uncommon.

Soft-tissue rim sign